>I would like to use a 16F87x for this, and in
>assembly (or if someone could help me find a decent
>compiler for some other language, that would be simpler).
>The 16F877 already has a hardware PWM, and I plan to
>use that, but I'm confused on how to make variable
>frequency and variable pulsewidth.

This sounds to me like it would be an ideal project for something like a
dsPIC, for which there is a free C compiler available from Microchip. It
also has hardware PWM.

Another possibility would be an 18F family chip, AFAIK these all come with
hardware PWM, and the Microchip C compiler has a demo version which is
easily kept working for the life of a project by re-installing.

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